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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Schulz Electric™ Refurbishes Critical Circulating Water Pump Motor in Only Four Days
Schulz Electric™ was contacted by a nuclear power plant in the New England region that serves a community of over 2 million homes. After five years of service, a 1500 HP, 4 kV, 24-pole circulating water pump motor (measuring approximately 7’ wide, 8’ tall, and weighing several tons) needed refurbishing while the plant was still online. To add to their concern, the power plant is located close to the ocean. The aging motor was not only approaching the end of its serviceable life, but was highly susceptible to moisture intrusion and the salt-laden air, which can build up in air passages within the motor. These environmental conditions can lead to elevated operating temperatures and corrosion developing on the rotor, stator, and shaft components. These factors combined, placed the plant at an increased risk of downtime that could have potentially led to a significant loss of revenue if they were forced into a shutdown event.
Sergey V. Konovalov, Sergey V. Putvinsky
Fusion Science and Technology | Volume 18 | Number 3 | November 1990 | Pages 397-402
Alpha Particles in Fusion Research | Technical Paper | doi.org/10.13182/FST90-A29273
Articles are hosted by Taylor and Francis Online.
The influence of static helical perturbations on high-energy ion motion in tokamaks is investigated. Numerical solutions of drift motion equations are in good agreement with analytic estimations of the critical amplitude value that is sufficient for destruction of drift surfaces. Three types of perturbations are considered: large-scale helical modes with wide regions of localization comparable with the plasma column radius, small-scale modes localized near the resonant magnetic surfaces, and balloon-like modes. For all three cases, high perturbation amplitudes are needed for destruction of drift surfaces. The static helical perturbation does not appear to lead to noticeable high-energy particle losses in tokamaks until the perturbation amplitude exceeds the value sufficient for magnetic surface destruction.
